252805861643 has 2 divisors, whose sum is σ = 252805861644. Its totient is φ = 252805861642.

The previous prime is 252805861639. The next prime is 252805861661. The reversal of 252805861643 is 346168508252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 252805861643 - 2² = 252805861639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 252805861591 and 252805861600.

It is not a weakly prime, because it can be changed into another prime (252805831643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126402930821 + 126402930822.

It is an arithmetic number, because the mean of its divisors is an integer number (126402930822).

Almost surely, 2^252805861643 is an apocalyptic number.

252805861643 is a deficient number, since it is larger than the sum of its proper divisors (1).

252805861643 is an equidigital number, since it uses as much as digits as its factorization.

252805861643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2764800, while the sum is 50.

The spelling of 252805861643 in words is "two hundred fifty-two billion, eight hundred five million, eight hundred sixty-one thousand, six hundred forty-three".